Each section ends with a quiz to test your new knowledge. Make your selection and click "Check my answers" to check each individual question. If you want an explanation for the answer, click "Explain".
Note: your score won't be tallied; this is just for review purposes.
Which of the following is NOT a category of transformers?
Attributes
Workflows
Images
Data Quality
Images are classified as Rasters, so there is no category for Images, but there is one for Rasters.
Match the following transformer to its category:
Chopper
Attributes
Geometry
Rasters
Calculated Values
Use the Transformer Gallery to search for these transformers to determine their category
NullAttributeMapper
Attributes
Geometry
Rasters
Calculated Values
Use the Transformer Gallery to search for these transformers to determine their category
ImageFetcher
Attributes
Geometry
Rasters
Calculated Values
Use the Transformer Gallery to search for these transformers to determine their category
ExpressionEvaluator
Attributes
Geometry
Rasters
Calculated Values
Use the Transformer Gallery to search for these transformers to determine their category
Look at this screenshot of an editing dialog and tell me what the value returned to the attribute will be:
2+2
4
4.0
Error!
The key is to notice that the header of this dialog says "Text Editor". Therefore the value returned to this attribute will be the literal string "2+2". If the user wishes to add 2+2 to get 4, they should have used the arithmetic editor!
Which is the BEST transformer to use, if you wanted to test for a Yes/No value?
Tester
ExpressionEvaluator
AttributeManager
AttributeFilter
The Tester can be set up easily to test one value TestAttribute=Yes. Where as the ExpressionEvaluator is used for math operations, the AttributeFilter is better for testing multiple values and the AttributeManager takes a bit longer to set up a conditional value.
Look at the following screenshot, then answer how many features will appear in the output connection...
Eight (8)
Eighteen (18)
Twenty-six (26)
Can't tell
It's impossible to tell from the screenshot, because you don't know how many attribute values will be a match. Because there are eight fire halls it will be anywhere from zero to eight, but that's all we can tell. In fact if it was a FeatureJoiner transformer there could be as many as 144 matches, if every fire hall somehow matched to every postcode boundary!